US6617384B2 - Racing tire tread rubber composition - Google Patents

Racing tire tread rubber composition Download PDF

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Publication number
US6617384B2
US6617384B2 US08/932,245 US93224597A US6617384B2 US 6617384 B2 US6617384 B2 US 6617384B2 US 93224597 A US93224597 A US 93224597A US 6617384 B2 US6617384 B2 US 6617384B2
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United States
Prior art keywords
rubber
weight
parts
rubber composition
racing tire
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Expired - Lifetime
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US08/932,245
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English (en)
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US20020052436A1 (en
Inventor
Noboru Wakabayashi
Toru Iizuka
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Assigned to SUMITOMO RUBBER INDUSTRIES, LTD. reassignment SUMITOMO RUBBER INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IIZUKA, TORU, WAKABAYASHI, NOBORU
Publication of US20020052436A1 publication Critical patent/US20020052436A1/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016—Compositions of the tread
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/02—Vulcanised oils, e.g. factice

Definitions

  • the present invention relates to a racing tire tread rubber composition.
  • An object of the present invention is to provide a racing tire tread rubber composition which is used for producing a racing tire having excellent wet grippability and does not cause any excessive adhesion in tire production process steps such as the kneading and extruding steps.
  • the present inventors studied diligently about the types or the amount of the combination of additives, which are combined into a racing tire tread rubber composition containing silica, in order to solve the above-mentioned problems. As a result, the inventors attained the present invention.
  • a racing tire tread rubber composition is a composition comprising: 100 parts by weight of a diene-based rubber; a filler, the entirety of which is in the range of 100 to 250 parts by weight containing 20 parts by weight or more of silica; and 5 to 50 parts by weight of a factice.
  • FIG. 1 is a micrograph as obtained by observing a section of a tread portion of a tire according to Example 1.
  • FIG. 2 is a magnified micrograph in the microscopical observation of FIG. 1 .
  • a racing tire tread rubber composition is a composition comprising: a diene-based rubber; a filler containing silica as the essential component; and a factice.
  • the diene-based rubber as used in the present invention is at least one type selected from the group consisting of natural rubber and diene-based synthetic rubbers.
  • examples of the diene-based synthetic rubbers include styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), isoprene-isobutyrene rubber (IIR), and butyl halide rubber (X-IIR). These diene-based rubbers may be used alone respectively or, if need arises, in combinations of two or more thereof.
  • SBR styrene-butadiene rubber
  • IR isoprene rubber
  • IIR isoprene-isobutyrene rubber
  • X-IIR butyl halide rubber
  • the filler as used in the present invention is combined to provide sufficient hardness to a racing tire as produced by shaping the rubber composition.
  • the filler is not especially limited providing that it contains silica as the essential component. The inclusion of silica improves the adhesive friction and thereby enhances the wet grippability.
  • fillers other than silica include: inorganic fillers such as carbon black, clay, talc, calcium carbonate, basic magnesium carbonate, alumina, mica, graphite, and glass powder; and organic fillers such as high styrene resin, coumarone-indene resin, phenol resin, modified melamine resin, and petroleum resin. At least one of these fillers can be used jointly with silica.
  • the ratio of the combination of the filler (containing silica) in the racing tire tread rubber composition is in the range of 100 to 250 parts by weight, preferably, 120 to 200 parts by weight, more preferably, 140 to 180 parts by weight, per 100 parts by weight of the diene-based rubber.
  • the amount of the combination of the filler is larger than 250 parts by weight, a large load or the excessive adhesion might occur in tire production process steps such as kneading and extruding steps.
  • the amount of the combination of the filler is smaller than 100 parts by weight, there is a possibility that the hysteresis loss might not be large, that sufficient friction might not be obtained, and that the wet grippability might therefore be deteriorated.
  • the ratio of the combination of silica, which is the essential component of the filler is 20 parts by weight or more per 100 parts by weight of the diene-based rubber. Where the ratio of the combination of silica is less than 20 parts by weight, there is a possibility that sufficient adhesive friction might not be obtained, and that the wet grippability might therefore be deteriorated.
  • the ratio of the combination of silica is preferably not less than 50% by weight, more preferably, not less than 70% by weight, of the entirety of the filler. Where the ratio of the combination of silica is less than 50% by weight, there is a possibility that sufficient adhesive friction might not be obtained, and that the wet grippability might therefore be deteriorated. In addition, where the ratio of the combination of silica is increased, it is preferable to also increase the ratio of the combination of the below-mentioned factice in order to avoid the excessive adhesion.
  • the factice is combined to solve the problem of the excessive adhesion as caused by combining silica.
  • the factice is a component as commonly called “SABU” in Japanese and is a cured oil of 1.03 to 1.05 in specific density and is a brittle solid with elasticity like rubber.
  • SABU a component as commonly called “SABU” in Japanese and is a cured oil of 1.03 to 1.05 in specific density and is a brittle solid with elasticity like rubber.
  • the factice for example, can be obtained by reacting an animal or vegetable oil and fat of 70 or more in iodine value with sulfur or a sulfur-containing compound such as sulfur chloride under heating.
  • the factice examples include: white factice which is white or light yellow and has a sulfur content of 6 to 8%; brown factice which is a black brown elastomer as obtained by adding sulfur to an oxidized vegetable oil and heating to high temperature and has a sulfur content of 15 to 20%; transparent amber-colored factice as produced by action of only sulfur chloride; and special factices as obtained from different animal or vegetable oils and fats of starting materials.
  • brown factice is preferable, because the brown factice has a great effect to prevent the excessive adhesion.
  • the factices may be used alone respectively or, if need arises, in combinations of two or more thereof.
  • the ratio of the combination of the factice in the racing tire tread rubber composition is in the range of 5 to 50 parts by weight, preferably, 10 to 40 parts by weight, more preferably, 20 to 30 parts by weight, per 100 parts by weight of the diene-based rubber. Where the ratio of the combination of the factice is larger than 50 parts by weight, the resultant rubber might be too soft, and the abrasion resistance might therefore be low. In addition, where the amount of the combination of the factice is smaller than 5 parts by weight, the excessive adhesion occurs in tire production process steps such as rubber-kneading and extruding steps.
  • the wet grippability is preferably further improved.
  • the reason for this is as follows: as to a rubber composition having a high ratio of a factice, a rubber as obtained by vulcanizing this composition has so high softness as to decrease the hysteresis loss, but a tire as formed from this rubber has a wide area contacting a road, so that the wet grippability is improved.
  • the factice as contained in a tread portion of a tire can easily be verified by observing a section of the tread portion with a microscope.
  • the racing tire tread rubber composition may further comprise the following additives: softeners such as naphtene-based process oil and aromatic oil; low temperature plasticizers such as phthalic derivatives, adipic derivatives, azelaic derivatives, sebacic derivatives, and phosphoric derivatives; vulcanizers such as sulfur, insoluble sulfur, and sulfur compounds; covulcanizers (vulcanization activators) such as zinc oxide and stearic acid; vulcanization accelerators such as thiazole-based compounds (e.g., mercaptobenzothiazole (MBT), benzothiazyl disulfide (MBTS), N-tert-butyl-2-benzothiazolylsulfenamide (TBBS), N-cyclohexyl-2-benzothiazylsulfenamide (CBS)) and guanidine-based compounds (e.g. diphenylguanidine (DPG)); organic fibers; foaming agents; antioxidants; and wax.
  • the composition for example, can be obtained by kneading the above-mentioned components with kneading-machines such as kneaders and Banbury mixers under conventional conditions by conventional methods.
  • kneading-machines such as kneaders and Banbury mixers
  • the kneading temperature is preferably in the range of 120 to 180° C.
  • a racing tire is obtained by shaping and vulcanizing the above-explained racing tire tread rubber composition.
  • the racing tire tread rubber composition of the present invention can provide a racing tire tread rubber composition which is used for producing a racing tire having excellent wet grippability and does not cause any excessive adhesion in tire production process steps such as kneading and extruding steps.
  • First stage batch the entirety of SBR, half of silica, half of carbon black, half of aromatic oil, the entirety of coupling agent, and the entirety of factice.
  • Second stage batch the kneaded mixture resultant from the first stage batch, the other half of the silica, the other half of the carbon black, the other half of the aromatic oil, the entirety of stearic acid, and the entirety of zinc white (zinc oxide).
  • Third stage batch the kneaded mixture resultant from the second batch, the entirety of sulfur, and the entirety of vulcanization accelerators.
  • Tires were made using the resultant tread rubber compositions while evaluating the excessive adhesion in the below-mentioned way.
  • Thin piece samples of 1.0 to 1.5 ⁇ m in thickness were cut off from tread portions of the resultant tires with a MICROTOME, and then swelled with an organic solvent (xylene), and then attached to glass plates, and then observed with a microscope. During this observation, micrographs of sections of the thin pieces were taken.
  • FIG. 1 is a micrograph of a magnification of 100
  • FIG. 2 is a micrograph of a magnification of 200.
  • Lumps with a diameter of about 0.1 mm as seen on respective central portions of the micrographs are brown factices.
  • the kart tires were produced by way of a kneading (rubber-kneading) step, in which the Banbury type mixer (50 liters, K50 made by Kobe Seikosho Co., Ltd., revolution number 50 rpm) and a sheeter roll (24 inches, revolution number 20 rpm, temperature conditioning 95° C.) were used, and an extruding step, in which an extruder (4.5 inches, cold feed type, revolution number 25 rpm, line speed 5 m/minute) was used.
  • a kneading (rubber-kneading) step in which the Banbury type mixer (50 liters, K50 made by Kobe Seikosho Co., Ltd., revolution number 50 rpm) and a sheeter roll (24 inches, revolution number 20 rpm, temperature conditioning 95° C.) were used
  • an extruding step in which an extruder (4.5 inches, cold feed type, revolution number 25 rpm, line speed 5 m/minute
  • An extruded tread as obtained by directly charging (cold-feeding) the stock rubber into the extruder and then discharging the stock rubber from the extruder, was subjected to a cooling step and then wound on to a reel.
  • the extruded tread standing in a heated state before cooling, was conveyed with a plenty of roller conveyors on a way to the cooling step after discharged from the extruder. In the extruding step, to what degree the extruded tread standing in a heated state adhered to the roll was observed.
  • the adhesion was evaluated on the basis of the following evaluation standard both in the above-mentioned rubber-kneading and extruding steps.
  • a racing car as equipped with the above-obtained kart tires (size: Front 10*4.50-5 KT6, Rear 11*6.50-5 KT6) was allowed to run 10 laps on a wet circuit with a lap length of about 700 m, and the average value of three fastest lap time data was calculated.
  • Comparative Example 5 the abrasion performance was extremely bad.
  • Comparative Examples 3 and 4 excessive adhesion occurred in the tire production process.
  • Comparative Example 3 because the excessive adhesion was extreme, no tire could not be produced.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US08/932,245 1996-09-24 1997-09-17 Racing tire tread rubber composition Expired - Lifetime US6617384B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP25201796 1996-09-24
JP8-252017 1996-09-24

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US20020052436A1 US20020052436A1 (en) 2002-05-02
US6617384B2 true US6617384B2 (en) 2003-09-09

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EP (1) EP0831123B1 (de)
DE (1) DE69712006T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060189746A1 (en) * 2005-02-23 2006-08-24 Sumitomo Rubber Industries, Ltd. Rubber composition and racing tire having tread comprising thereof
US20060198209A1 (en) * 2005-02-23 2006-09-07 Tran Bao Q Nano memory, light, energy, antenna and strand-based systems and methods
US10179479B2 (en) 2015-05-19 2019-01-15 Bridgestone Americas Tire Operations, Llc Plant oil-containing rubber compositions, tread thereof and race tires containing the tread
US10808106B2 (en) 2015-11-11 2020-10-20 Bridgestone Americas Tire Operations, Llc Saturated triglyceride-containing rubber composition, tires and tire components containing the rubber composition, and related methods

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE236215T1 (de) 2000-07-24 2003-04-15 Continental Ag Kautschukmischung
JP5357371B2 (ja) * 2000-07-31 2013-12-04 コンパニー ゼネラール デ エタブリッスマン ミシュラン タイヤ用トレッド
JP4572600B2 (ja) 2004-03-09 2010-11-04 東海ゴム工業株式会社 ゴム製品の製法およびそれにより得られたゴム製品
US20070206558A1 (en) * 2006-03-01 2007-09-06 Motorola, Inc. Method and apparatus for transmitting distributed fdma and localized fdma within a same frequency band
JP2016030789A (ja) * 2014-07-29 2016-03-07 横浜ゴム株式会社 空気入りタイヤ
JP2016030815A (ja) * 2014-07-30 2016-03-07 横浜ゴム株式会社 タイヤ用ゴム組成物

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629038A (en) 1968-02-07 1971-12-21 Asahi Chemical Ind Method for bonding rubber composition to metal
US4429068A (en) * 1980-11-20 1984-01-31 Hohyu Rubber Co., Ltd. Rubber material
JPS624732A (ja) 1985-06-29 1987-01-10 Yokohama Rubber Co Ltd:The タイヤトレツド用ゴム組成物
US5017660A (en) * 1987-08-04 1991-05-21 Asahi Kasei Kogyo Kabushiki Kaisha Selectively, partially hydrogenated polymer and rubber composition and impact resistant styrenic resin containing the same
US5049610A (en) * 1986-09-26 1991-09-17 Ube Industries, Ltd. Fiber-reinforced rubber composition and production process and use thereof
EP0559218A1 (de) 1992-03-06 1993-09-08 Mitsui Petrochemical Industries, Ltd. Vulkanisierbare Kautschukmischung
WO1995034601A1 (en) 1994-06-14 1995-12-21 Akzo Nobel N.V. Improved cure parameters in rubber vulcanization
US5500482A (en) 1993-09-20 1996-03-19 The Yokohama Rubber Co., Ltd. Rubber composition for tire tread

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629038A (en) 1968-02-07 1971-12-21 Asahi Chemical Ind Method for bonding rubber composition to metal
US4429068A (en) * 1980-11-20 1984-01-31 Hohyu Rubber Co., Ltd. Rubber material
JPS624732A (ja) 1985-06-29 1987-01-10 Yokohama Rubber Co Ltd:The タイヤトレツド用ゴム組成物
US5049610A (en) * 1986-09-26 1991-09-17 Ube Industries, Ltd. Fiber-reinforced rubber composition and production process and use thereof
US5017660A (en) * 1987-08-04 1991-05-21 Asahi Kasei Kogyo Kabushiki Kaisha Selectively, partially hydrogenated polymer and rubber composition and impact resistant styrenic resin containing the same
EP0559218A1 (de) 1992-03-06 1993-09-08 Mitsui Petrochemical Industries, Ltd. Vulkanisierbare Kautschukmischung
US5500482A (en) 1993-09-20 1996-03-19 The Yokohama Rubber Co., Ltd. Rubber composition for tire tread
WO1995034601A1 (en) 1994-06-14 1995-12-21 Akzo Nobel N.V. Improved cure parameters in rubber vulcanization

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060189746A1 (en) * 2005-02-23 2006-08-24 Sumitomo Rubber Industries, Ltd. Rubber composition and racing tire having tread comprising thereof
US20060198209A1 (en) * 2005-02-23 2006-09-07 Tran Bao Q Nano memory, light, energy, antenna and strand-based systems and methods
US7235599B2 (en) * 2005-02-23 2007-06-26 Sumitomo Rubber Industries, Ltd. Rubber composition and racing tire having tread comprising thereof
US7671398B2 (en) 2005-02-23 2010-03-02 Tran Bao Q Nano memory, light, energy, antenna and strand-based systems and methods
US10179479B2 (en) 2015-05-19 2019-01-15 Bridgestone Americas Tire Operations, Llc Plant oil-containing rubber compositions, tread thereof and race tires containing the tread
US10808106B2 (en) 2015-11-11 2020-10-20 Bridgestone Americas Tire Operations, Llc Saturated triglyceride-containing rubber composition, tires and tire components containing the rubber composition, and related methods

Also Published As

Publication number Publication date
EP0831123B1 (de) 2002-04-17
DE69712006T2 (de) 2002-10-24
DE69712006D1 (de) 2002-05-23
EP0831123A1 (de) 1998-03-25
US20020052436A1 (en) 2002-05-02

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